JP5581044B2 - Media cleaning method - Google Patents

Description

The present invention relates to media cleaning method for cleaning a media used in the media agitation type wet pulverizer.

  The media agitation type wet pulverizer is a pulverizer that agitates the processed material in a slurry state together with the media to perform pulverization to make fine particles. The target particle size after treatment is often 1 μm or less, and is often 100 nm or less. As described above, in the pulverization process with a small target particle size, the diameter of the medium to be used is small, and many media having a diameter of 0.2 mm or less are used.

  In the media agitation type wet pulverizer, when the medium to be used becomes small, it becomes difficult to separate the medium and the processed material. Patent Document 1 describes a structure of a media agitation type wet pulverizer that separates a medium and a processed product using a centrifugal separator. Patent Document 2 describes a pulverization system using such a media agitation type wet pulverizer.

  An example of the pulverization processing system described in Patent Document 2 is shown in FIG. The pulverization processing system 112 includes a media agitation type wet pulverizer 120 equipped with a centrifugal separator, a treated product holding tank 140, a circulation pump 130, and a circulation line 150 connecting them.

  The processed material put into the holding tank 140 is supplied to the media agitation type wet pulverizer 120 by the circulation pump 130, and after being subjected to the pulverization process, returns to the holding tank 140 again. Therefore, the processed product is repeatedly pulverized by the media stirring wet pulverizer 120. As a result, the pulverization process proceeds for the entire processed product in the system, and the refinement of the particles gradually proceeds.

  Further, the pulverization processing system 112 includes a recovery liquid tank 175, a media recovery tank 176, and a recovery line 185 connecting them. Thereby, after completion | finish of a grinding | pulverization process, the media in the media stirring type wet grinding machine 120 are recoverable.

  That is, after completion of the pulverization process, the plurality of valves are switched while the rotating portion of the media agitation type wet pulverizer 120 is in an operating state. The collected liquid is allowed to flow toward 176. Thereby, all the media in the media agitation type wet pulverizer 120 can be recovered in the recovery tank 176.

  It is also described that the media collected in the media collection tank 176 can be washed using a stirrer 177 as needed. When changing the processing object to be handled, it is necessary to clean the pulverization processing system 112 as a whole, and it is preferable to clean the media well to remove the deposits.

  Since the media collide by stirring the media with the stirrer 177, the surface deposits can be peeled off. However, weak agitation is not preferable because the probability of media collision is low and the cleaning efficiency does not increase. Further, strong agitation is not preferable because the media is crushed by the collision between the media.

  Therefore, this cleaning operation needs to determine optimum conditions such as concentration and strength of stirring, but it is a difficult operation depending on the experience of the operator. In addition, a long time is often required for cleaning even under optimum conditions. In addition, when a part of the media is crushed, it takes a long time to remove the crushed media. Furthermore, dehydration and rinsing after washing is also a work that requires a lot of time.

JP 2006-247557 A JP 2009-125682 A

The subject of this invention is providing the media washing | cleaning method which can wash | clean the medium used with the media stirring type wet-grinding machine easily after completion | finish of a grinding | pulverization process. In other words, it is a media cleaning method that can be cleaned in a short time with high cleaning efficiency and does not cause media crushing, and a media cleaning method capable of rinsing after cleaning and removing the crushed media without human intervention. It is to provide.

In order to solve the above problems, the media cleaning method according to claim 1 of the present invention is a medium cleaning method for cleaning a media used in the media agitation type wet pulverizer sieve in a part of the wall A cylindrical media container formed with a surface and rotatable about an axis; a cleaning tank for storing a cleaning liquid therein; and a liquid level of the cleaning liquid stored in the cleaning tank and the axis mixed but in a state where an angle of 15 to 70 °, a portion of the sieve surface using media washer you rotate immersed in the cleaning solution, a large large particles having a particle diameter than the media with the cleaning media It has adopted the means to make.

In addition, the media cleaning method according to claim 2 of the present invention employs means in the media cleaning method according to claim 1, wherein the cleaning tank includes an ultrasonic oscillator capable of performing ultrasonic cleaning. ing. The media cleaning method according to claim 3 of the present invention, in the media cleaning method according to claim 1 or 2, wherein the liquid supply and drainage of the cleaning tank, and a control for controlling the rotation and stop of the media container The apparatus is equipped with a vessel and employs means for automatically performing the process from the start of operation through the washing operation and the rinsing operation to the stoppage.

  In the cylindrical media container, the media is gently agitated in a state where it sinks below the cleaning liquid. In the state of being uniformly dispersed by the stirrer as described above, the probability that the interparticle distance between the media is large and the collision is low. However, in the settled state, the media are in a state of being in close contact with each other, and the interparticle distance is reduced, and the probability of collision and friction with each other increases.

Therefore, the media cleaning method of the present invention can clean the media after the pulverization process in a short time. Further, since the washing process is performed with gentle stirring, the media is not crushed. And the solid substance adhering to a medium and the grinding | pulverization piece of the media which generate | occur | produced in the grinding | pulverization process can be isolate | separated easily. Further, the entire process can be easily automated, and the washing operation to the rinsing operation can be performed without manpower.

It is a schematic longitudinal cross-sectional view which shows an example of the media washing machine used by this invention. It is explanatory drawing for demonstrating the difference in the cleaning effect by the difference in an angle, (1) when an angle is 0 degree, (2) when an angle is 35 degrees, (3) when an angle is 90 degrees Indicates. It is a block diagram which shows the control system of the washing machine shown in FIG. It is a flowchart which shows the control system of the washing machine shown in FIG. It is explanatory drawing of the crushing processing system containing the conventional washing | cleaning method.

It has been shown one embodiment of a media washer Ru used in the present invention in FIG. The media washing machine 10 includes a cylindrical media container 20 that is formed to be rotatable about an axis, an electric motor 40 that rotates the media container 20, and a cleaning tank 30 that stores a cleaning liquid therein.

  The media container 20 has a cylindrical shape and is formed so that media can be placed therein. The cross-sectional shape can be a polygon or an ellipse in addition to a circle. The media container 20 has a sieve surface 21 formed on a part of the wall surface. The wall surface refers to the upper wall surface 25 or the lower wall surface 26 serving as the wall surfaces of the upper and lower ends, or the peripheral wall surface 27 serving as the cylindrical wall surface.

  Usually, a cylindrical frame body is formed between the disk-shaped upper wall surface 25 and the lower wall surface 26, and a sieve cloth is stretched on the frame body to form a peripheral wall surface 27 that becomes the sieve surface 21. Many. A lid for taking in and out the media is often provided on the upper wall surface 25 or the lower wall surface 26. However, the sieve surface 21 may be formed on the upper wall surface 25 or the lower wall surface 26, and a lid may be formed on the peripheral wall surface 27. As a material for forming the sieve surface 21, a stainless steel wire mesh, a resin wire mesh such as nylon, polyester, polyethylene, polypropylene, fluororesin, or a carbon mesh can be used.

  The relationship between the inner diameter (D) of the media container 20 and the axial length (L) is that the length (L) is larger than the inner diameter (D) and smaller than twice the inner diameter (D), that is, D <L <2D relationship is preferable. Here, when the cross-sectional shape of the media container 20 is not circular, the inner diameter (D) can be considered as an equivalent diameter.

  A rotation shaft 22 is provided on the upper wall surface 25 of the media container 20 along the axis. By driving the rotation shaft 22 by the electric motor 40, the media container 20 can be rotated around the axis. Here, the electric motor 40 is fixed by an appropriate holding member, and generates an output for rotating the rotary shaft 41. The media container 20 is rotated by connecting the rotation shaft 41 of the electric motor 40 and the rotation shaft 22 of the media container 20. In addition, when the whole media washing machine 10 becomes large sized, it is preferable to provide a rotating shaft also in the lower wall surface 26 and to support it at both ends of the media container 20.

  The media container 20 is rotated relatively slowly. The number of rotations is preferably 10 to 100 rotations per minute. If the rotation is too slow, the cleaning speed becomes slow. If the rotation is too fast, some of the particles are dispersed in the cleaning liquid and the distance between the particles is increased. At the same time, the other particles are attached to the sieve surface 21 and do not move, and the cleaning performance is deteriorated. . Therefore, the optimum rotation speed is appropriately selected according to the material and particle size of the media.

Media washer 10, to the liquid surface 31 of the cleaning liquid stored in the washing tank 30, to use in a state where the axis is inclined in the media container 20. In this state, the media container 20 is rotated by immersing a part of the sieve surface 21 in the cleaning liquid. As a result, the cleaning performance specific to the present invention can be obtained.

  The difference in cleaning performance depending on the angle θ between the liquid surface 31 and the shaft core will be described with reference to FIG. Here, it is assumed that the entire peripheral wall surface 27 of the media container 20 forms a sieve surface. FIG. 2 (1) shows a case where the angle θ is 0 °, (2) shows a case where the angle θ is 35 °, and (3) shows a case where the angle θ is 90 °. In either case, the media is settled in the media container 20 and receives a force that a part of the media is dragged to the peripheral wall surface 27 by the rotation of the media container 20.

  When the angle θ of (1) is 0 °, it seems that the media in the media container 20 is reliably agitated by the rotation of the media container 20 and good cleaning performance is obtained. However, as can be seen from this figure, the media hardly moves in the horizontal direction. Moreover, the entire media rolls as one body, and the relative movement between particles is very small. That is, there is not much sliding between the media particles.

  When the axis is inclined with respect to the liquid surface 31 as in (2), the medium that has settled in the media container 20 moves both in the circumferential direction and in the axial direction, and the entire particle is in a very complicated flow state. It becomes. In addition, since the medium moves in a concentrated state, sliding between the media particles is intense, and a large cleaning effect can be obtained. The value of the angle θ is preferably in the range of 15 to 70 °, and the best cleaning effect can be obtained in the range of 30 to 55 °.

  Part of the particles in contact with the peripheral wall surface 27 and the lower wall surface 26 falls after being lifted up above the liquid surface 31 with rotation. At this time, the falling particles greatly change their positions both in the axial direction and in the circumferential direction with respect to the original position, and a large mixing effect can be obtained on the entire medium. Therefore, the entire medium can be washed uniformly.

  Moreover, since each particle | grain settles toward the lower end part in the media container 20, it will be in the concentrated slurry state and each particle | grain will be in the state closely_contact | adhered to each other. Therefore, since each particle is always slid in contact with other particles, a strong cleaning effect can be obtained. In particular, when falling from a position higher than the liquid level 31, a severe sliding action occurs between the particles at the dropping point. And the outstanding washing | cleaning performance can be acquired by the synergistic effect of this strong washing | cleaning effect and the uniform mixing effect.

  In order to ensure excellent cleaning performance, it is preferable that the volume of the medium put into the media container 20 is 10 to 50% with respect to the internal volume. That is, by setting it to 50% or less, it is possible to ensure good movement of the media. On the other hand, if it is less than 10%, the amount of processing becomes small, resulting in inefficient cleaning.

  It is preferable that the liquid surface position with respect to the media container 20 is submerged to a position where the entire medium has settled below the liquid surface at least in a rotation stopped state. Further, it is preferable that the sieve surface 21 of the peripheral wall surface 27 is always floated on the liquid surface by the rotation of the media container 20. Due to such a positional relationship, the medium that has settled in the vicinity of the peripheral wall surface 27 is extracted slightly from the liquid surface 31 by the rotation of the media container 20 and drained, and then falls into the liquid. Thereby, a preferable mixing effect can be obtained.

  When the angle θ in (3) is 90 °, it can be seen that the media hardly moves even if the media container 20 is rotated. That is, since all the particles rotate together with the media container 20, there is almost no movement between the particles, and a cleaning effect cannot be expected.

The media cleaning method of the present invention can have higher performance by using ultrasonic cleaning together. In FIG. 1, an ultrasonic oscillator 50 is provided at the bottom of the cleaning tank 30. The oscillating ultrasonic wave preferably has a frequency of 10 to 100 KHz, and preferably has an output of about 1 W with respect to 1 g of the medium to be cleaned.

  Further, by mixing large particles having a diameter of about 10 times the medium to be cleaned, higher performance can be achieved. The amount of large particles to be mixed is preferably 5 to 20% by mass with respect to the medium to be washed. The large particles are preferably made of the same material as the medium to be cleaned.

The media cleaning method of the present invention preferably includes a controller 60 that controls water supply to the cleaning tank 30 and rotation of the media container 20 to form a control system as shown in FIG. And it is preferable to perform automatically the process from the start of operation to the stop through the cleaning operation and the rinsing operation.

  The controller 60 allows the operator to input necessary information such as operation conditions and start of operation by operating buttons. Further, a signal from the liquid level gauge can be input to the controller 60. The controller 60 outputs control information to open / close the water injection valve 71 and the drain valve 72, to rotate and stop the media container 20, to oscillate and stop the ultrasonic oscillator 50, and to display input information and operating conditions. Display, lamp display, etc. can be performed if necessary.

  The flow of work in the control system of FIG. 3 is shown in a flowchart in FIG. As preparations before cleaning, the media is put into the media container 20 and the detergent is put into the cleaning tank 30. It is assumed that the liquid level can set the full position L1 and the empty position L2. Then, while inputting the cleaning time T1, the rinsing time T2, and the number of times of rinsing N while viewing the display, the start button is pressed to turn it on to start the automatic operation.

  First, the water injection valve 71 is opened and water injection into the cleaning tank 30 is started. The liquid level 11 is input to the controller 60 and compared with the set full position L1, and when the liquid level 11 exceeds the full position L1, the water injection valve 71 is closed. In the full state, the oscillation of the ultrasonic oscillator 50 and the rotation of the media container 20 are turned on, the cleaning operation is started, and the operation time t1 is measured by a timer.

  When the operation time t1 reaches the set cleaning time T1, the oscillation of the ultrasonic oscillator 50 and the rotation of the media container 20 are turned off. Then, the drain valve 72 is opened, the liquid level 11 is compared with the empty position L2 set by inputting to the controller 60, and the drain valve 72 is closed and cleaned when the liquid level 11 becomes equal to or lower than the empty position L2. Driving ends.

  The rinsing operation starts with the number of operations n being 1. Then, the water injection valve 71 is opened and water injection into the cleaning tank 30 is started. The controller 60 receives the liquid level 11 and compares it with the set full position L1. When the liquid level 11 exceeds the full position L1, the water injection valve 71 is closed. In the full state, the oscillation of the ultrasonic oscillator 50 and the rotation of the media container 20 are turned on, the rinsing operation is started, and the operation time t2 is measured by a timer.

  When the operation time t2 reaches the set rinsing time T2, the oscillation of the ultrasonic oscillator 50 and the rotation of the media container 20 are turned off. Then, the liquid level 11 is input to the controller 60 and compared with the set empty position L2. When the liquid level 11 becomes equal to or lower than the empty position L2, the drain valve 72 is closed and the rinsing operation is finished. .

  The rinsing operation is preferably performed a plurality of times. Therefore, the operation number n is compared with the set rinsing number N. If n has not reached N, 1 is added to n and the rinsing operation is repeated once more. When n reaches N, the end lamp is turned on to notify that all the work has been completed. It is also preferable to use a buzzer together. The operator turns off the power and collects the washed media. When large particles are used, they are sorted by sieving and stored separately.

As described above, the media cleaning method of the present invention can be automatically operated by including the controller 60, and can be performed from the start of the operation to the stop through the cleaning operation and the rinsing operation only by performing simple settings. All processes can be performed automatically.

DESCRIPTION OF SYMBOLS 10 Media washing machine 20 Media container 21 Sieve surface 22, 41 Rotating shaft 25 Upper wall surface 26 Lower wall surface 27 Peripheral wall surface 30 Washing tank 31 Liquid surface 40 Electric motor 50 Ultrasonic oscillator 60 Controller 71 Water injection valve 72 Drain valve 112 Crush processing system 120 Media agitation type wet crusher 130 Circulation pump 140 Holding tank 150 Circulation line 175 Recovery liquid tank 176 Media recovery tank 177 Stirrer 185 Recovery line

Claims (3)

A media cleaning method for cleaning media used in a media agitation type wet pulverizer,
A cylindrical media container formed so that a sieve surface is formed on a part of the wall surface and rotatable about the axis, and a cleaning tank for storing a cleaning liquid therein,
Wherein in a state where the liquid surface of the cleaning liquid stored in the washing tank and said axis forms an angle of 15 to 70 °, using Rume Deer washer to rotate immersed part of the sieve surface to the cleaning liquid,
A medium cleaning method comprising mixing a large particle having a particle size larger than that of the medium to be cleaned. The media cleaning method according to claim 1, wherein the cleaning tank includes an ultrasonic oscillator capable of performing ultrasonic cleaning. Provided with a controller for controlling the supply and drainage of the cleaning tank and the rotation and stop of the media container, the process from the start of operation to the stop through the cleaning operation and the rinsing operation is automatically performed. The media cleaning method according to claim 1 or 2, wherein the media cleaning method is performed .

Images